Question

# Electric field outside a long wire carrying charge q is proportional to :

A
1r
B
1r2
C
1r13/5
D
1r13/2
Solution
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#### Using Gauss Law across the cylindrical Gaussian surface,∫E.dS=qencϵ0∴E×2πr×l=λ×lϵ0∴E=λ2πrϵ0Here λ is the linear charge density on the wire. 0
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